Card reader system with improved interface
US4065662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1976 |
| Grant date | Dec 27, 1977 |
| Priority date | — |
| Expiry date | May 26, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A card reader system providing for a plurality of card reader units to be interfaced commonly to a single central processing unit, each card reader unit having an interface assembly wholly contained within the card reader electronics package and providing for Hollerith to ASCII conversion, retransmission of card data as often as requested, and suppression of trailing zeros in the transmitted card data. Each interface assembly provides for the generation and transmission of status signals upon the occurrence of predetermined card reader conditions. Means are provided in each card reader for receiving address characters from the CPU whereby each respective card reader is selectively enabled or disenabled from communicating with the CPU depending upon whether or not it has been properly addressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.